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STATE OF CALIFORNIA
MODEL 242L
DC ISOLATOR UNIT
OPERATIONS MANUAL
THE MODEL 242L DC ISOLATOR UNIT IS DESIGNED AND MANUFACTURED IN THE USA BY
EBERLE DESIGN INC., PHOENIX, ARIZONA, AN ISO 9001:2015 REGISTERED COMPANY.
U.S. PATENT NO. 7,855,893
© COPYRIGHT 2015 EDI
SERIAL NUMBER: 1506XXXXX and up
PCB Issue A, 110-0244-001
REVISION: JUNE 2015
pn 888-2420-001
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Summary of Contents for EDI 242L
- Page 1 STATE OF CALIFORNIA MODEL 242L DC ISOLATOR UNIT OPERATIONS MANUAL THE MODEL 242L DC ISOLATOR UNIT IS DESIGNED AND MANUFACTURED IN THE USA BY EBERLE DESIGN INC., PHOENIX, ARIZONA, AN ISO 9001:2015 REGISTERED COMPANY. U.S. PATENT NO. 7,855,893 © COPYRIGHT 2015 EDI...
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Page 2: Table Of Contents
Table of Contents 1.1 Glossary ......................1 1.2 General Description..................1 1.3 General Characteristics ................1 1.4 Installation and Adjustments ...............2 1.4.1 Minimum Output Pulse .................2 1.4.2 Input Polarity ..................2 1.5 Theory of Operation ..................2 1.5.1 System Description ................2 1.5.2 Input Circuit ..................3 1.5.3 MCU Circuit ..................3 1.5.4 Output Circuit ..................3 1.5.5 Display and Switch Circuit ..............3... -
Page 3: Glossary
24VDC Cabinet Power Supply and does not require AC Line. 1.3 GENERAL CHARACTERISTICS Each channel of the Model 242L provides input hysterisis and digital filtering to qualify the input signal. An input signal must meet the minimum pulse requirements specified in section 1.7.5 in order to produce a valid output. -
Page 4: Installation And Adjustments
The sensor circuitry can be broken down into seven major blocks. Each “Input Circuit” block contains the electrical transient devices and the input biasing circuit. Although the Model 242L has two DC inputs, a single digital processing section is used to process both inputs. -
Page 5: Input Circuit
The Model 242L requires no adjustments or preventive maintenance. 1.6.1 TROUBLE ANALYSIS The following list should be used to trouble-shoot the Model 242L installation. If the Model 242L unit itself is suspect, see Section 1.6.2 for a complete internal testing sequence. -
Page 6: Trouble Shooting Sequence
Model 242L Operations Manual a. Input voltage or pulse width does not meet the requirements of section 1.7.4 or 1.7.5. Verify that the DC input voltage level is less than the DC Inputs True specification. Verify that the DC input pulse width is greater than the Input Pulse Width Accept specification. -
Page 7: Timing
Model 242L Operations Manual False (high) ....................greater than 12 Vdc Optically Isolated Solid State Outputs True (low, 50 mA) ....................less than 1.5 Vdc False (high) ....................greater than 16 Vdc Maximum Leakage Current (high) ................. less than 1 uA Maximum Current ....................... -
Page 8: Parts List And Schematic
Model 242L Operations Manual 1.8 PARTS LIST AND SCHEMATIC |------------------------------------------------------------------------------------------------------------------| |Item|EDI Part Number|Qty|Description |Reference |Manufacturer |----+---------------+---+-------------------------------------------------+-------------------+-------------------| |(NO COMPONENT) |(no component) |10 |(NO COMPONENT) |CH1-2 GND GND_1 OPT| |TEST TEST1-2 VCC |VDD |(NO COMPONENT) |M1-2 |215-0033-S |RESISTOR, 1/2W, 0.33 OHMS, 5%, 2010 surface mount|R74 R99 |215-0180-S |RESISTOR, 1/2W, 1.8 OHMS, 5%, 2010 surface mount |R14... - Page 9 Model 242L Operations Manual |CL31A106KAHNNNE |320-2210-050S |CAPACITOR, CER.MULT, 220pF, 50V, 10%, 1206 CHIP |C17 |410-0053-S |DIODE, TRANS. SUPR., SMA5.0A, 5V,SMA |CR14 CR16 |MOTOROLA |410-0110-S |DIODE, ULTRAFAST, MURA110T3, 100V,1A, SMA |CR27 CR30 |ON SEMI |410-0141-S |DIODE, SCHOTTKY, MBRX140, 40V,1A, SOD123 |CR29...
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